The fundamental works of Wolniewicz [1]}, [2]}
on the H\(_2\)  molecule
represent the beginning of solving the ab initio  electronic structure problem for two-electron systems.
Modern developments built on work
by Wolniewicz [3]}, [4]}, [5]}
includes the papers by Pachucki, Komasa and co-workers
[6]}, [7]}, [8]},
which demonstrate excellent continuation of Wolniewicz's earlier
work. Indeed, it has been said [9]}, [10]}, [11]}, [12]} that
state-of-the-art ab initio  calculations [13]}, [14]} represent a solution for the H\(_3^+\)  molecular
ion; although there are a number of studies showing that further work is required on this important [15]} and
fundamental ion [16]}, [17]}, [18]}, [19]}, [20]}, [21]}, [22]}, [23]}, [24]}.
